Butler Performance • Pontiac Tech
350 Compression Calculator
Static compression ratio & displacement for the Pontiac 350 block. Enter your build below — results update instantly.
Static Compression Ratio
9.5 : 1
Total Displacement
354 ci
Per-Cylinder Volume Breakdown
Swept volume725.1 cc
Chamber volume72.0 cc
Deck volume0.0 cc
Gasket volume7.7 cc
Piston volume+6.0 cc
Total clearance volume85.7 cc
8-cylinder Pontiac V8. This is a static (geometric) compression ratio for build planning. cc your actual heads and confirm deck height after machining. Questions on your combo? Ask a Butler Tech ›
350 Block — Cubic Inch Reference
| Bore | 3.75 | 4.00 | 4.21 |
|---|---|---|---|
| Stock 3.876 | 354 | 378 | 397 |
| +.030 3.906 | 359 | 383 | 404 |
| +.040 3.916 | 361 | 385 | 406 |
| +.060 3.936 | 365 | 389 | 410 |
Ready To Build?
Dial in your compression with the right pistons, gaskets, and a matched rotating assembly.
Shop Pistons
Shop Head Gaskets
350 Rotating Assemblies
350 Compression Calculator
| Bore: (diameter) | ||
| Stroke: | ||
| Cylinder Head Volume: | ||
| Effective Dome Volume: Butler Ross Flat Top -8cc |
||
| Deck Clearance: | ||
| Compressed Gasket Thickness: .040 is standard thickness | ||
| Number of Cylinders: | ||
| Compression Ratio : | ||
| Total Displacement (in.3) : | ||
|
|
| 350 Block | Stroke | |||||
| Bore | 3.75 | 4.00 | 4.21 | 4.25 | 4.50 | |
| Stock | 3.875 | 354 | 377 | 401 | ||
| +.030 | 3.905 | 359 | 383 | 407 | ||
| +.040 | 3.915 | 361 | 385 | 409 | ||
| +.060 | 3.935 | 365 | 389 | 413 | ||